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Analytically Evaluating the Properties and Performance of Layered Magnetoelectric Composites

Department of Mechanical and Aerospace Engineering, University of California, Los Angeles 420 Westwood Plaza, Los Angeles, CA90095, USA, gavin{at}ucla.edu

Gregory P. Carman

Department of Mechanical and Aerospace Engineering, University of California, Los Angeles 420 Westwood Plaza, Los Angeles, CA90095, USA

A theoretical model has been developed for predicting the magnetoelectric (M-E) coupling effect of magnetostrictive-piezoelectric layered composites (MPLC). This model determines the individual effects of MPLC configurations and material properties on the homogenized M-E voltage coefficient, ^', curves. By analyzing the model, a 3D ^' sequencing map covering the span of compliance, Poisson's ratio, and piezomagnetic coefficient ratio q₃₃/q₃₁ of the magnetostrictive phases is generated to aid the MPLC design. Six MPLC configurations are addressed in this study, including three field orientations, longitudinal, transverse, and in-plane, in both 1D and 2D geometries. Results show that the piezoelectric volume fraction required for achieving the maximum M-E effect is dependent upon the compliance. Higher compliance values cause the ^' peaks to be attenuated, as well as shifted to lower piezoelectric volume fractions. This study also investigates the influence of the piezomagnetic coefficient q₃₃ and the ratio q₃₃/q₃₁ on ^' . For a constant ratio q₃₃/q₃₁, larger q ₃₃-values increase ^'. However, changing this ratio alters the relative ordering of the ^'-values for each of the six MPLC configurations studied. This demonstrates that the ratio q₃₃/q ₃₁ strongly influences the selection of the MPLC configurations to produce the largest M-E coupling effect. By integrating the results from this model into 3D ^' sequencing map, the ideal MPLC configuration with the highest M-E coupling effect can be predicted for all possible MPLC magnetostrictive phases.

Key Words: magnetoelectric • modeling • magnetoelectric voltage coefficient • piezoelectric • magnetostrictive • layered.

This version was published on November 1, 2008

Journal of Intelligent Material Systems and Structures, Vol. 19, No. 11, 1271-1280 (2008)
DOI: 10.1177/1045389X07085410


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